Here's the problem.
Big Tech (FB, Twitter, Google, etc.) have been arguing they are protected by Section 230 by virtue of them being "platforms", not publishers. They can't be held liable nor accountable for anything a member publishes on the open platform. If someone posts something that is unlawful (child porn, inciting violence, etc.) the authorities go after the people who posted it, NOT the service providing the platform.
Now, Amazon Web Services is treating the PLATFORM (Parler) differently, holding them accountable for what members posted.
Double standard.
Since the other Big Tech "platforms" own their servers and infrastructure, they are immune from this kind of retribution by a service provider.
The whole situation details another reason why Big Tech has become so dangerous. If everyone who starts up a new social media site wants to protect themselves from similar BS, they will need to own their servers or at least lease them from a company that's not under the thumb of the Left, the DNC or Big Tech. That severely hinders new competition -- just what any monopoly or oligopoly desires.
BTW, it should be fairly obvious to everyone by now that one of Big Tech's agenda items is to promote and protect the bit MSM corporations while censoring, demonetizing and deplatforming the Right, independent journalists and smaller media organizations.